Products & Specifications
What is the difference between single wall and dual wall heat shrink tubing?
Single wall provides electrical insulation only. Dual wall (adhesive-lined) has an inner layer of hot-melt adhesive that creates a waterproof seal during shrinking. Use single wall for general insulation; use dual wall for outdoor, underground or moisture-exposed connections.
What shrink ratio do I need — 2:1, 3:1 or 4:1?
Measure the largest diameter you need to pass over (connector, lug) and the smallest diameter you need to seal onto. Ensure the expanded ID is 20% larger than the largest point, and the recovered ID is 20% smaller than the smallest point. If the ratio between the two exceeds 2.5:1, use 3:1 or 4:1.
What is the temperature range of your tubing?
Standard polyolefin operates from -55°C to 105°C continuously. Special grades (PTFE, Viton) reach 200-260°C. Refer to each product's datasheet for exact ratings.
What standards do your products comply with?
IEC 60502-2 (power cable accessories), IEC 60684 (flexible insulating sleeving), UL 224 (heat shrink tubing), RoHS. Type test reports available for MV accessories.
Can you provide custom colors?
Standard colors: black, red, yellow, green, blue, white, clear. Custom colors for qualified volumes. Orange available for EV high-voltage identification.
Ordering & Quotation
What information do I need for a quotation?
System voltage, cable type (single/three-core, XLPE/PVC), conductor cross-section (mm² or AWG), quantity, target delivery date and destination country/port. Photos of the cable drum label are helpful.
What is your MOQ?
Standard tubing: 500 m per size/color. MV cable kits: 20 kits per type. Custom printed: 1,000 m per design. Custom colors: 2,000 m. Exact MOQ stated in your quotation.
What are your payment terms?
First order: 30% T/T deposit, 70% before shipment. Repeat customers: negotiable. L/C accepted for orders over USD 10,000.
How fast can you respond to an RFQ?
Within one business day for standard products. Complex MV configurations may take 2-3 business days.
Can I get free samples?
Standard tubing samples (1-2 m per size) are free; buyer covers freight. MV kits and custom products quoted case by case. Sample lead time: 3-5 working days.
Lead Time & Shipping
What is your typical lead time?
Standard tubing: 15-25 days. MV cable kits: 25-35 days. Custom printed/OEM: 20-30 days. Urgent requirements can be discussed.
What Incoterms do you work with?
EXW, FOB, CIF and DDP. Most customers use FOB (Shanghai or Shenzhen) or CIF to destination port.
How are products packed?
Tubing coiled on spools or in cartons. MV kits individually boxed with instructions. Export packing with moisture-proof bags and reinforced cartons. Pallets available on request.
Installation & Technical
What temperature should I use to shrink the tubing?
Standard polyolefin shrinks at 90-110°C. Use a heat gun, start from one end and work toward the other. Avoid open flames unless specifically rated.
What is the difference between heat shrink and cold shrink?
Heat shrink requires a torch or heat gun. Cold shrink uses pre-stretched silicone that contracts when the support core is removed — no heat needed. Cold shrink is preferred in confined spaces, hazardous areas and emergency repairs.
How do I choose the correct size?
Measure the largest diameter to pass over and the smallest to seal onto. Choose a size where expanded ID ≥ largest × 1.2 and recovered ID ≤ smallest × 0.8.
Company & Quality
Are you a manufacturer or a trading company?
Manufacturer. Hubei Zhizheng Rubber & Plastic New Material Co., Ltd., since 1998. Factories in Huangshi, Hubei and Dongguan, Guangdong.
What quality certifications do you have?
ISO 9001:2015, ISO 14001:2015, OHSAS 18001:2007, IATF 16949:2016 (automotive). Products UL 224 listed, RoHS compliant, SGS verified. Type test reports for MV accessories available on request.
